This song is about these two couples, and along in their relationship the guy starts getting feelings about not being ready to be with her since they are too young and he wants to see what else is out there first. Then when he says "i've had a broken heart before", he was probably saying that he once gave it a chance with a girl and called her his future wife, but then she ended up breaking up with him for the same reasons hes breaking up with his girl now. And like the title, he doesn't want her, but he knows that he would end up hurting her more if he cheats on her because of temptations.
This song is about these two couples, and along in their relationship the guy starts getting feelings about not being ready to be with her since they are too young and he wants to see what else is out there first. Then when he says "i've had a broken heart before", he was probably saying that he once gave it a chance with a girl and called her his future wife, but then she ended up breaking up with him for the same reasons hes breaking up with his girl now. And like the title, he doesn't want her, but he knows that he would end up hurting her more if he cheats on her because of temptations.